1. From the Department of Neurology (L.K., E.M., P.G., J.D., P.A.R., W.H., T.S., J.B.), University of Heidelberg, Heidelberg, Germany; Department of Neurology (M.S.), Comenius University, Bratislava, Slovakia; and Departments of Anesthesiology (H.B.) and of Neuroradiology (C.H.), University of Heidelberg, Heidelberg, Germany.